Geotechnical Engineering Properties of Mt. Mazama Ash and its Influence on the Strength of Latah Creek Floodplain Soils
Faculty Sponsor
Richard Orndorff
rorndorff@ewu.edu
Session Type
Poster Presentation
Research Project Abstract
We tested Mt. Mazama ash from the Latah Creek area of Spokane for the geotechnical engineering properties according to ASTM standards. We determined the specific gravity, Atterberg limits, particle size distribution, and the optimum water content for compaction. We then conducted a series of Unconfined Compressive Strength tests on the Mt. Mazama ash to determine its behavior under stress. We conducted three strength tests with varying amounts of compactive effort to determine how the ultimate and yield strength changed with the increased compactive effort. We then looked at the behavior of previously tested Latah Creek floodplain soils with Mazama ash interbeds. Each soil behaved differently with ash interbeds, the presence of the ash increased the strength of Latah soil 1 and reduced the strength of the Latah soil 2.
Session Number
PS3
Location
HUB Multipurpose Room
Abstract Number
PS3-aa
Geotechnical Engineering Properties of Mt. Mazama Ash and its Influence on the Strength of Latah Creek Floodplain Soils
HUB Multipurpose Room
We tested Mt. Mazama ash from the Latah Creek area of Spokane for the geotechnical engineering properties according to ASTM standards. We determined the specific gravity, Atterberg limits, particle size distribution, and the optimum water content for compaction. We then conducted a series of Unconfined Compressive Strength tests on the Mt. Mazama ash to determine its behavior under stress. We conducted three strength tests with varying amounts of compactive effort to determine how the ultimate and yield strength changed with the increased compactive effort. We then looked at the behavior of previously tested Latah Creek floodplain soils with Mazama ash interbeds. Each soil behaved differently with ash interbeds, the presence of the ash increased the strength of Latah soil 1 and reduced the strength of the Latah soil 2.
